which of the following statements are true regarding introns? select all that apply.
a) an intron is a portion of mRNA that does not code for protein
b) an intron is a portion of mRNA that must be removed before translation
c) an intron is a portion of mRNA that undergoes translation in the cytoplasm
a) an intron is a portion of mRNA that does not code for protein
b) an intron is a portion of mRNA that must be removed before translation
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The atrioventricular node is the normal pacemaker of the heart
a. True b. False Indicate whether the statement is true or false
The large muscle that spans the entire width of the lower back is the ________.
Fill in the blank(s) with the appropriate word(s).
Which of the dural septa separates the cerebrum from the cerebellum?
A. Falx cerebri B. Tentorium cerebelli C. Tentorium cerebri D. Falx cerebelli E. Falx cranii
Many birds eat plant material, but the hoatzin (Opisthocomus hoazin), a South American bird, is the only avian species known to employ foregut fermentation. Hoatzins are herbivorous; green leaves make up more than 80 percent of their diet
More than a century ago, naturalists observed that hoatzins smell like fresh cow manure, and a study of the crop and lower esophagus of hoatzins revealed that bacteria and protozoa like those found in the rumen of a cow break down plant cell walls, releasing volatile fatty acids that are absorbed in the gut. Considering the abundance of plant material that is available to birds and the widespread use of fermentative digestion by mammals, why do you think the hoatzin is the only foregut fermenter among birds?